Improvement in permutation-locks



PATENT y Canton.

EDVARD NV. BRETTELL, OF ELIZABETH, NEI/V JERSEY.

INPROVEIVI ENT INy PERM UTATloN-LOCKS.

Specification forming part of Letters Patent No. 83,1529, dated October 20, 1868.

To all whom it may concern: v

Be it known that I, EDWARD W. BRETTELL, of the city of Elizabeth,in the county of Union and State of N ew Jersey, have invented certain new and useful Improvements in Permutation-Locks; and I do hereby declare the following to be a full and exact description of the same, reference being had to the drawings accompanying this specification, as part of the same. Y

The nature of my improvement consists in some peculiar construction of the outside case, adapting it to the operation of the new and improved parts in the interior of the revolving box covered by my patent of August 27, 1867, and of new interior arrangements.

In the drawings, Figure l, Plate .1, shows the interior of the lock. Fig. 2, Plate 1, shows the last of the series of tumblers, and also the only pawl in the lock, and the position ofthe pawl when locked. Fig. 3, Plate l, shows dierent views of the pawl. Fig. 4, Plate 1, shows a new construction of tumblers, with provision for change of numbers in the interior of each. Fig. 5 shows the lever and cam that retain the tumblers immovable in their positions when set to the desired numbers. Fig. 6 is the key that sets fast the tumblers.

Fig. 1, Plate 2, is a View of the back of the lock, with plate for journals thereon. Fig. 2, Plate 2, shows the revolving box, the tumblers and washers, the central adjusting-plates, with the stud or pin which moves each tumbler. There is also shown the position of the pawl when unlocked.

The same letters refer to the same parts in each gure and plate.

The outer case, A, of the lock has no shaft or stud. In a suitable circular recess the circular box B revolves freely upon journals on each side, one journal being fast to the front side, and the other projecting from the cap C on the back of the box, and is shown at c1. The bearing for the journal on the front side of the box is in the outer case, A, and the bearing for the other journal, c,is the cross-bar'D.

A hollow shaft, E, is cast fast to the interior of the revolving box B, upon which all the interior tumblers are made to revolve. I do not confine myself to any definite number of tumblers. In the drawings there are four. They are constructed with two disks, screwed together, Fl F2, Fig. 4, Plate 1. The rim of F1 is raised to leave room in the interiory for the ring G, the edge of G being milled for a purpose hereinafter shown. Three (more or less,

if required,) bars, level with the top of the rim, to receive the screws that hold lF1 and F2 together, and to form a bearing and guide for the edge of the ring G, are cast inFl, and are shown by c1222?. A dovetail recess is formed in the side of z2, to receive' the end of the lever y, Fig. 5, Plate 1. Upon the edge of the lever y two sharp-edged projections, x and w, are pressed against or released from the milled edge of G by the turning of the cam t.

The tumblers thus made are placed on the shaft E, which passes through the center of G, so that G can turn on the shaft, and F turn on G, or both be turned together when locked to each other by the lever y and the cani c.

Three of the four tumblers are placed upon the shaft E, the end of the shaft' entering one side of the fourth or back one, but not passing through. A shaft, H, attached to the knob I,` passes through the outer case, and also through the shaft E, and screws into the fourth or back tumbler fm in the center of G, thus turning it with the knob, yet they said tumbler fm is susceptible of adjustment by means of the lever y and cam n, the same as the three that turn upon the shaft E.

The cam c is in the ring F in all the tumblers, and a key, Fig. 6, Plate 1, is provided, which, when passedthrou gh the four tumblers, holds the four receiving-notches u in the outer edge of said tumblers in a line with each other, so that the pawl can fall in them and release the revolving box, as shown in Fig. 2, Plate 2, where the box is turned and the nose J is lifted, so that the barof the bolts in the door can pass into the aperture Kin the outer case A.

While the key is through the cams o, it, by being turned, releases the levers y from the rings G, which then are at liberty to be set to any of the numbers on the dial byrevolving the knob I, and when set are set fast by turning the key and pressing the levers y against the milled edges of G; and as the projection on theJ key is only as long as the thick ness ofthe four tumblers, and as it cannot turn until through the cap C, it cannot be withdrawn until all the tumblers are in the posi l 'Y i tion to allow the pawl to fall `and unlock the hollow box, nor until Gr is fast to F. The key being withdrawn leaves the tulnblers at liberty to turn either way and be revolved by the knob any number of times.

The pawl, Fig. 3, Plate l, turns on a pin in the rim of the hollow box B, therefore moves with it when it turns. A The under edge of the arm t on the pawl rests on the edge of the tumbler that is fastto the knob-shaft H, Fig. 2, Plate 2. While the indentations u in the other tuniblers are square, the indentation in the tumblers on which the arm t rests is an inclined plane on one side and perpendicular on the other.

Upon the end of the arm t on the pawl, parallel with the pin on which it turns, is a bar, s, which has a recess provided for it in the rim of the revolving box B. rlhis bar eX- tends over the three other tulnblers, and falls into the indentations u when they are in a line with each other, which takes place when the combination numbers have been turned in the proper Way. When the pawl falls, it releases the bolt 9' on it from the recess p in the outer case A, and leaves the box at liberty to turn and unlock. Vhen the knob is turned to lock, the pawl is by the inclined plane. lifted, and leaves the knob at liberty to turn either way, because it has shifted the position of the other tumblers, by turning it farther than needed to lock it.

The edge of the arm t projects a little below the bottom of the bar s, raising it above the other tumblers, so that it cannot catch thc edges of the indentations u in passing. A recess, L, is formed in the outer case A for the nose J on the hollow box B, which forms the needed stops for the box.

The tumblers in the box are separated by means of the washers 0, and move each other by means of the pins n on the rings Gr.

lVhat I claim as my improvement, and de sire to secure by Letters Patent, is-

The hollow Wheel B, pawl t, with its arms fr and s, in combination with the inner circular tumblers and the case A, all constructed and arranged to operate in the manner and for the purpose set forth.

E. W. BRETTELL.

lVitnesses NV. M. GooDING, EDWARD CoLLvER. 

